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v2.4.1.9

Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Investments, at fair value: |  |  |  |
Equity securities (cost $189,032; $27,449) | $ 412,880 us-gaap_TradingSecuritiesEquity | $ 281,883 us-gaap_TradingSecuritiesEquity |  |
Short-term investments (cost $9,744; $11,089) | 372,542 us-gaap_ShortTermInvestments | 315,776 us-gaap_ShortTermInvestments |  |
Total investments | 3,403,822 us-gaap_Investments | 3,158,312 us-gaap_Investments |  |
Cash | 289,907 us-gaap_Cash | 266,508 us-gaap_Cash | 158,183 us-gaap_Cash | 211,393 us-gaap_Cash
Accrued investment income | 38,737 us-gaap_AccruedInvestmentIncomeReceivable | 36,120 us-gaap_AccruedInvestmentIncomeReceivable |  |
Current income taxes | 503 us-gaap_IncomeTaxReceivable | 0 us-gaap_IncomeTaxReceivable |  |
Deferred income taxes | 0 us-gaap_DeferredTaxAssetsNet | 15,220 us-gaap_DeferredTaxAssetsNet |  |
Other assets | 21,512 us-gaap_OtherAssets | 14,336 us-gaap_OtherAssets |  |
Total assets | 4,600,289 us-gaap_Assets | 4,315,181 us-gaap_Assets |  |
Liabilities: |  |  |  |
Notes payable | 290,000 us-gaap_NotesPayable | 190,000 us-gaap_NotesPayable |  |
Accounts payable and accrued expenses | 130,887 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent | 127,663 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent |  |
Current income taxes | 0 us-gaap_AccruedIncomeTaxesCurrent | 11,856 us-gaap_AccruedIncomeTaxesCurrent |  |
Deferred income taxes | 5,333 us-gaap_DeferredIncomeTaxLiabilities | 0 us-gaap_DeferredIncomeTaxLiabilities |  |
Other liabilities | 207,028 us-gaap_OtherLiabilities | 170,665 us-gaap_OtherLiabilities |  |
Total liabilities | 2,724,843 us-gaap_Liabilities | 2,492,695 us-gaap_Liabilities |  |
Shareholders’ equity: |  |  |  |
Common stock | 88,705 us-gaap_CommonStockValue | 81,591 us-gaap_CommonStockValue |  |
Additional paid-in capital | 3,804 us-gaap_AdditionalPaidInCapitalCommonStock | 411 us-gaap_AdditionalPaidInCapitalCommonStock |  |
Retained earnings | 1,782,937 us-gaap_RetainedEarningsAccumulatedDeficit | 1,740,484 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Total shareholders’ equity | 1,875,446 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,822,486 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,842,497 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
Total liabilities and shareholders’ equity | 4,600,289 us-gaap_LiabilitiesAndStockholdersEquity | 4,315,181 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent Company [Member] |  |  |  |
Investments, at fair value: |  |  |  |
Equity securities (cost $189,032; $27,449) | 182,300 us-gaap_TradingSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 29,737 us-gaap_TradingSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term investments (cost $9,744; $11,089) | 9,744 us-gaap_ShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11,089 us-gaap_ShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in subsidiaries | 1,783,049 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,794,164 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total investments | 1,975,093 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,834,990 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash | 52,326 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 46,332 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,199 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 29,219 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accrued investment income | 158 us-gaap_AccruedInvestmentIncomeReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16 us-gaap_AccruedInvestmentIncomeReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Amounts receivable from affiliates | 1,181 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 206 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current income taxes | 239 us-gaap_IncomeTaxReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IncomeTaxReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Deferred income taxes | 6,975 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,068 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Income tax receivable from affiliates | 3,482 mcy_IncomeTaxReceivableDueFromAffiliate / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11,573 mcy_IncomeTaxReceivableDueFromAffiliate / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 1,095 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 459 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 2,040,549 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,894,644 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities: |  |  |  |
Notes payable | 150,000 us-gaap_NotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 50,000 us-gaap_NotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accounts payable and accrued expenses | 0 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 23 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Amounts payable to affiliates | 97 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 34 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Income tax payable to affiliates | 14,728 mcy_IncomeTaxPayableDueToAffiliate / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,730 mcy_IncomeTaxPayableDueToAffiliate / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current income taxes | 0 us-gaap_AccruedIncomeTaxesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12,672 us-gaap_AccruedIncomeTaxesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other liabilities | 278 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,699 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 165,103 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 72,158 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Shareholders’ equity: |  |  |  |
Common stock | 88,705 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 81,591 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Additional paid-in capital | 3,804 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 411 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 1,782,937 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,740,484 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total shareholders’ equity | 1,875,446 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,822,486 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and shareholders’ equity | 2,040,549 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,894,644 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Equity securities trading - cost | 189,032 us-gaap_TradingSecuritiesEquityCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 27,499 us-gaap_TradingSecuritiesEquityCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term investments - cost | $ 9,744 us-gaap_TradingSecuritiesShortTermInvestmentsAmortizedCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 11,089 us-gaap_TradingSecuritiesShortTermInvestmentsAmortizedCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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